class_docstr: Input tag object associated with a dataset.
code: def to_proto(self):
      tag = ProtoInputTag()
      tag.key = self.key
      tag.value = self.value
      return tag
  
file_path: mlflow/mlflow/entities/input_tag.py
imports: from mlflow.entities._mlflow_object import _MLflowObject
  from mlflow.protos.service_pb2 import InputTag
  from mlflow.utils.annotations import experimental
label_desc: Use image node_id 5 for calling the InputTag obj's underlying member method code with example usage: obj.to_proto() and returns: tag